Glossary of the Gemtrade

A color that is most desired in one variety replica watches can be off-color in another variety, like yellow brown chrysoberyl cats eye (in) compared to yellow brown sapphire (out).Offer: Making an offer is to name and commit to a price you are willing to pay for a gemstone. Taking back an offer without very good reason is deemed rather impolite in the trade and might result in being shunned next time.Opaque: No light falls directly through a stone. Some varieties are opaque by definition (opal) while others may be just very included.Origin: The place where a gem is mined. An origin can be different from the ;country of manufacturing; which, legally and for tax purposes, is defined as the place where a stone is ;cut;. Premium origins like Ceylon or Burma command higher prices. Pad: Short form for padparadscha, a rare orange pink sapphire.Pale: Other word for light tone. A pale stone has little ;saturation;.Parcel: More than one gemstone sold for a package price. As a rule, if you negotiate a parcel price you cannot later cherry-pick from the parcel but you either have to take the complete parcel or reject it. Point: 0.01 carat. Measure used for smallest stones (to make it sound bigger). For example 10 points is 0.10 carat, which is really small but doesn’t sound so bad. Mostly used for diamonds.Recovery: Percentage of a gem that remains after cutting and polishing the rough. A realistic recovery rate is 20%. Thus one needs one gram of ;rough; to make a carat of final gem. The term is also used to describe the loss in re-cuts, e.g. from an emerald cut into a scissor.Rough: Uncut unpolished gemstone including crystals.

Glossary of the Gemtrade

This mostly happens when the lapidary, in order to replica watches keep weight and luster, follows the natural shape of the rough stone. The alternative to being off-center is usually a ;window; and much less weight. The luster of such stones often runs unequal or leans towards one side. Nevertheless, being slightly off-center is not considered a major flaw but only a lesser evil as compared to a ;fish eye; in half the size. Off-color: Hues outside the classics like cornflower blue, maize yellow or rosé red. Off-color does not mean ugly or unattractive but *** currently not in fashion in a specific variety. Off-colors can be good investments and are often just as beautiful as classical hues. If you can’t see an inclusion with a 10fold lens, it does not exist for grading purposes. If a stone has no inclusions under the microscope (rare) it can sometimes not be distinguished from a synthetic. Inclusions are also essential to determine treatments. Inspection period: Agreed upon period in which a buyer can decide to return the stone or a parcel.Lapidary: Person or company faceting gemstones. Lens or loupe: Small, handheld and mostly foldable, glass with 10 (standard for grading) or 20fold (sophisticated) magnifying power. Inseparable from any professional gem trader and collector. Should be neutral in frame color and a triplet. Cost: between $2 and $100, with $20 doing fine.Lot: Big ;parcel; of gemstones.Mine-run: Most professional mines are organized in time-phases based on weather seasons or work cycles. For example, a mine team may dig out gem bearing gravel for one week and then wash the gravel in the next week and thus concluding one mine-run. Many mines actually have annual mine-runs, e.g. digging in the dry season or in summer and then washing in the rainy season.Natural gem: Gemstone formed in geological processes without the help of humans or simply: non-synthetic.Off-center: Cut in which the back does not close in the middle of the gemstone but off the center.

Glossary of the Gemtrade

Hence grading is to be differentiated from ;certification; in which a 3rd party testifies only the stones quantifiable features or a financial replica watches ;appraisal;.Grown: Grown is a term often used by fraudulent sellers to skip around the fact that their gem is synthetic and, therefore, worthless.Hunting: Search for an individual gemstone based on a buyer specification of size, color, cut etc.Hypnotic: Term used for the very best colors. Such a hue will imprint itself into your memory and will never be forgotten. It is quite a compliment for any gem. Imitations: Anything pretending to be a gem without being one.In the color: Sales term to describe the quality of a color as being best in that hue. Subjective judgment.Inclusion: Anything that hinders light falling through and out of the stone. Some inclusions are desired (horsetails, needles, silk) others not (cracks). Some can be very aesthetic (water lily) others are not (dirt).Also called ;Black-out;. Face: The upper dimensions of a stone which is visible after being set in jewelry. Sometimes also referred to as table. The face is the most important feature to look at when judging a gemstone size for jewelry. Faceting: Cutting and polishing a rough gemstone. Fish-eye: Term for a gemstone with a big ;window;. For diamonds the term is also used when a pavilion is cut too shallow, allowing the girdle reflection to show through the crown.Fluorescence: Though scientifically not correct, the term is use to describe a gem (especially a rubies) capabilities to glow on its own. In fact, the stone re-emits ultraviolet light.Gemologist: Anybody knowing enough about gems. No protected profession. Grading: Process of evaluation by a ;gemologist;, in particular the owner of the stone and thus including subjective non-qualitative characterization and overall rankings.

Glossary of the Gemtrade

Connoisseurs do use the term freely, yet it is hard to make them define it. Probably it is best understood by its antonyms: A bad crystal is dull, cloudy, indifferent, non-thrilling, undefined, muddy, fuzzy, boring etc. Cut: Process and result of faceting and polishing a gemstone replica watches. Dead: Rough that will not have luster after the cut, or a very badly faceted gemstone with no luster, mostly due to inclusions or a very bad ;crystal;.Energy: Expression used to describe a gems character on an emotional level. One may clearly perceive a gemstone as tranquil, intense or lively. Not scientific but often helpful. Extinct: Gem which does not throw back light and thus seems dark.A gemstone is clean if you need a lens to see the inclusions.Color Change/Shift: A color change gemstone will change its color when moved from day- to artificial light. If the two colors are very close to each other (e.g. violet and blue or red and purple) it is more accurate to speak of a color shift. Most gems show some sort of color change in different lights but only an obvious strong change would justify an extra charge. It should be mentioned in the ;certificate;.Cooked: Heated gemstone. Heavily cooked gems adorn 99% of all ready to buy jewelry. Crystal: A good crystal is one of the most mysterious qualities of a gemstone.